Tax Treaty Withholding Rate Lookup

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

With no annotations, the description is the sole source of behavioral information. The verb 'look up' and 'shows' imply a read-only operation, but no other behavioral details are disclosed, such as error handling for invalid country codes, data source, or return format. The inclusion of 'management fees' which is not in the payment_type enum could mislead about available parameters.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no filler. However, the author chose to list 'management fees' which is not a valid payment_type, adding a misleading detail that detracts from the otherwise efficient structure.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite the simplicity of the tool, the description lacks essential context: it does not describe the return format, default behavior, or how to request all rates (payment_type default), and the enumeration of payment types is inconsistent with the schema. Given no output schema and no annotations, the description is insufficient for an agent to reliably predict the tool's behavior.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Both parameters are fully described in the schema, so baseline is 3. The description does not add meaningful syntax or behavior beyond the schema, and actually introduces an unsupported category ('management fees') not present in the payment_type enum, potentially confusing the agent. Country_code is only paraphrased as 'specific country' with no additional detail.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool looks up Canada's tax treaty withholding rates for a specific country, with a specific verb ('look up') and resource. It names concrete rate categories (dividends, interest, royalties, management fees), which helps distinguish from generic tax tools. However, it does not explicitly differentiate from sibling tools like treaty_rates_table.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

No guidance is given on when to use this tool versus alternatives such as treaty_rates_table, foreign_tax_credit, or cross_border_transaction. The description only states what it does without specifying conditions, prerequisites, or exclusions.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.